Express Checkout ShippingOptionsView not creating shipping address correctly

[dorianfm]

It appears that paypal.express.ShippingOptionsView.post() does not select a valid country or set up a valid shipping address, leading to a failure to create correct shipping options.

According to the PayPal specification, https://developer.paypal.com/docs/classic/api/merchant/Callback_API_Operation_NVP/ the fields passed are different from the fields that are processed.

I've fixed this in a fork and will issue a PR